Lighting

As a relative newbie to Visad and J3D...
I have what might seem like some ignorant questions:

1) Do I change the lighting on a Display3DImpl
in the obvious way of adjusting the light branch in the
scene graph directly or is there support inside of
Visad to do this differently?

2) Similarly, is there a way to adjust the initial
orientation of a 3D Plot or should I essentially
adjust the camera position?   Do the interactors
provided control the object or the view branch
transform?

thanks,
- Steve